Transferred from the Department of Commerce, Bureau of Standards
Date: ca. 1920
Country of Origin: United Kingdom
Dimensions:
3-D Test (Steel Tube): 23.2 x 7.3cm (9 1/8 x 2 7/8 in.)
Materials:
steel, brass, plastic, paper
Physical Description:
60mm diameter, 235mm long; telescoping slide rule; ca.1920; cardboard.
